code: def __repr__(self):
      return "node_{}".format(id(self))
  
file_path: autograd/examples/dot_graph.py
imports: from __future__ import print_function
  import autograd.numpy
  from autograd.tracer import trace, Node
  from autograd import grad
label_desc: Use image node_id 3 for calling the GraphNode obj's underlying member method code with example usage: obj.__repr__() and returns: str